Cable ripper

ABSTRACT

The hand held tool for cutting the sheath of a cable or insulated conductor is comprised of a durable plastic body, aluminum components which make up the blade adjustment mechanism and stainless steel hardware. The spring loaded blade adjustment mechanism allows the user to cut into the cable sheath or conductor insulation at various depths. The roller bearing guide in conjunction with the stepped thumb grip allows the user to easily insert the cable as well as perform the process of cutting the cable sheath or insulated conductor. Standard utility knife blades are used as the integral component for cutting the cable sheath or conductor insulation. A compartment for storing extra utility knife blades is located in the body of the tool.

BACKGROUND OF THE INVENTION

Cables are utilized as a conduit or carrier for electric current andtypically consist of multiple individually insulated conductorscontained in an outer casing consisting of plastic, rubber, etc.,referred to as a sheath. Cable sheath removal is a common and necessarytask that must be performed to expose the underlying individualconductor(s) in a cable. Typically, removal of the outer cable sheath isaccomplished by cutting or tearing the sheath from the cable assembly.Although various models of cable sheath removal tools exist, it isbelieved that among the many unique aspects of this particular design,the following ones are the most distinctive.

BRIEF SUMMARY OF THE INVENTION

-   -   Uses a readily available standard utility knife blade, unlike        other existing cable outer sheath cutting tools.    -   Provides a unique method of fine cutting blade adjustment    -   Accommodates spare blade storage in an allocated space unlike        other existing cable outer sheath cutting tools.    -   Provides a unique cable guide mechanism.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1—

Isometric Detailed Exploded View, Roller & Slide Mechanism

FIG. 2—

Isometric Detailed Exploded View, Main Body, Blades & Cover

FIG. 3—

Isometric Detailed Exploded View, Blade Support & Adjustment Mechanism

FIG. 4—

Ismetric Assembled View

FIG. 5—

Top View, Blade Adjustment Mechanism, Extended & Retracted View

FIG. 6—

Top View, Slide Mechanism Retracted Position

FIG. 7—

Top View, Slide Mechanism Extended Position

FIG. 8—

Front View, Slide Mechanism, Extended & Retracted Position

DETAILED DESCRIPTION OF THE INVENTION

The Cable Ripper is a hand held tool that is designed to slit the outersheath of a cable for easy removal. The tool is designed to be ergonomicand ambidextrous. In normal use, the cutting adjustment can be performedsingle handed while holding the Cable Ripper, and with the index finger.The tool is designed to utilize readily available standardized utilityknife blades with easy blade replacement in mind. Removal of a sidecover on the tool allows access to the blade compartment and bladeadjustment mechanism. In addition, the blade compartment accommodatesspare blade storage. The tool has been designed to be lightweight and isconstructed primarily of durable plastic and aluminum components andstainless steel hardware, giving it rust resistant properties. The CableRipper is also provided with a D-Ring at the end of the handle that isutilized to hang the tool from a hook or tool belt clip.

The Cable Ripper is comprised of the following described and depictedcomponents as represented in the designated figures.

FIG. 1

-   Item 1—Slide-   Item 2—Stepped Thumb Grip-   Item 3—Cable Guide Roller-   Item 4—Guide Roller Support Pin-   Item 5—Roller Pin C-Clip-   Item 6—Guide Roller Bearing-   Item 7—Thumb Grip Attachment Screw

The Stepped Thumb Grip (2) is attached to the Slide (1) with the ThumbGrip Attachment Screw(s) (7). The Guide Roller Bearing(s) (6) arepressed into each side of the Cable Guide Roller (3). The Cable GuideRoller (3) is supported in the Slide (3) by the Guide Roller Support Pin(4). The Guide Roller Support Pin (4) is captured in the Slide (3) bythe Roller Pin C-Clip(s) (5).

FIG. 2

-   Item 8—Main Housing-   Item 9—Spare Utility Blade-   Item 10—Cutting Utility Blade-   Item 11—Housing Cover-   Item 12—Cover Attachment Screw

The Spare Utility Blade (9) is contained in the Main Housing (8) storagespace. The Cutting Utility Blade (10) is contained in the Main Housing(8). The Housing Cover (11) is attached to the Main Housing (8) via theCover Attachment Screw(s) (12).

FIG. 3

-   Item 8—Main Housing-   Item 13—D-Ring-   Item 14—Brass Tipped Set Screw-   Item 15—Blade Adjustment Tab-   Item 16—Adjustment Tab Support Pin-   Item 17—Blade Connection Pin-   Item 18—Adjustment Pin-Connection Pin-   Item 19—Threaded Blade Adjustment Pin-   Item 20—Wear Washer-   Item 21—Adjustment Tension Spring-   Item 22—Blade Adjustment Roller-   Item 23—Slide Support Pin

The D-Ring (13) is attached to the end of the Main Housing (8). TheBrass Tipped Set Screw(s) (14) are threaded into the Main Housing (8).The Blade Adjustment Tab (15) is supported in the Main Housing (8) viathe Adjustment Tab Support Pin (16). The Blade Connection Pin (17) ispressed into the Blade Adjustment Tab (15). The AdjustmentPin-Connection Pin (18) is pressed into the Blade Adjustment Tab (15).The Threaded Blade Adjustment Pin (19) is supported in the Main Housing(8) via the Blade Adjustment Roller (22). The Wear Washer(s) (20) andAdjustment Tension Spring (21) are supported in the Main Housing (8) viathe Threaded Blade Adjustment Pin (19). The Slide Support Pin (23) ispressed into the Main Housing (8).

FIG. 4

This figure depicts the assembled tool. The Stepped Thumb Grip (2) isattached to the Slide (1). The Cable Guide Roller (3) is supported bythe Slide (1). The Slide (1) is supported via the Main Housing (8) viathe Slide Support Pin (23). The Housing Cover (11) is attached to theMain Housing (8). The Blade Adjustment Roller (22) is supported in theMain Housing (8).

FIG. 5

This figure demonstrates the collective movement of the Blade AdjustmentMechanism. The Cutting Utility Blade (10) is extended and retracted inthe following described manner: The externally knurled and internallythreaded Blade Adjustment Roller (22) can be turned clockwise orcounterclockwise. This movement will cause the Threaded Blade AdjustmentPin (19) to extend or retract (depending on the direction that the BladeAdjustment Roller (22) is turned). The Threaded Blade Adjustment Pin(19) is connected to the Blade Adjustment Tab (15) via the AdjustmentPin-Connection Pin (18). The Blade Adjustment Tab (15) is supported viathe Adjustment Tab Support Pin (16) that allows the Blade Adjustment Tab(15) to pivot. This pivot action and the fact that the Cutting UtilityBlade (10) is supported via the Blade Connection Pin (17) allows theCutting Utility Blade (10) to be extended and retracted in a finelyadjusted manner. The Brass Tipped Set Screw(s) (14) cause the CuttingUtility Blade (10) to be justified to one side (eliminating excessiveCutting Utility Blade (10) side gap and possible rocking).

FIGS. 6 & 7

These figures depict the Slide (1) mechanism in an extended andretracted position. The Slide (1) mechanism cups the Main Housing (8)and is supported via the Slide Support Pin (23). As depicted in FIG. 6,pushing the Stepped Thumb Grip (2) causes the Slide (1) to be extendedand is limited by the Slide Support Pin (23).

As depicted in FIG. 7, pulling the Stepped Thumb Grip (2) causes theSlide (1) to be retracted, this action is limited by the Slide SupportPin (23).

FIG. 8

This figure depicts the front view extended and retracted action of theSlide mechanism as well as the Cutting Utility Blade. It also shows theD-Ring installed on the Main Housing.

OPERATIONAL DESCRIPTION

The Cable Ripper is used in the following manner:

The Main Housing (8) is grasped in either the left or right hand in away that the thumb rests on the Stepped Thumb Actuator (2), therebyenabling the thumb to push and pull the Slide (1) upward and downward.During normal use, the index finger should rest on the knurled BladeAdjustment Roller (22), thereby enabling the index finger to turn theBlade Adjustment Roller (22) clockwise and counterclockwise. This actionwill cause the Threaded Blade Adjustment Pin (19) to push or pull theBlade Adjustment Tab (15) and in turn extend or retract the CuttingUtility Blade (10). The Stepped Thumb Actuator (2) is pushed until theSlide (1) is moved to a fully extended position.

The cable is then inserted through the Slide (1) opening, under theCable Guide Roller (3) from the index finger side towards the thumb sideto the desired sheath removal length. The Slide (1) is then retractedwith the thumb until the Cable Roller Guide (3) applies pressure on thecable sheath. This pressure is maintained for the remainder of theoperation. The cable is then pulled out of the Slide (1) opening towardthe index finger side of the tool. The cut sheath can then be removed.

1. We claim the Cable Ripper is a hand tool that cuts the outer sheathof a cable or insulated conductor lengthwise to a pre-adjusted depthutilizing a standard utility knife blade.
 2. A hand tool according toclaim 1 in which the blade cutting depth is finger adjustable with aunique finite zero to one-eighth inch adjustable mechanism especiallydesigned to accommodate a standard utility knife blade.
 3. A hand toolaccording to claim 2 in which the cutting blade adjustable mechanism isspring loaded to insure the depth will not vary during use.
 4. A handtool according to claim 1 in which the roller slide mechanism allowspressure to be asserted upon the cable or conductor to insure an evendepth of cut along the length of the cable or conductor without the useof extreme force to pull the cable or conductor through.
 5. A hand toolaccording to claim 1 in which additional standard utility knife bladescan be stored in the handle or body of the tool.